A New Chapter for Capital Markets
The London Stock Exchange Group (LSEG) won regulatory approval to operate a private-share trading platform under the UK’s PISCES framework, a milestone that could redraw the relationship between private and public capital markets.
The new Private Securities Market (PSM) allows private companies to offer intermittent liquidity events, regulated windows where insiders and selected investors can buy and sell shares without a full IPO.
Advocates say the system will broaden access and make London more competitive as a listing destination, while critics worry it could fragment markets and reduce the incentives for firms to pursue public listings.
This introduction sets the stage for examining how the PSM works, why investors and issuers might favour it, and what the broader implications are for capital formation, transparency and market depth.
How the PISCES/PSM Model Works — Intermittent Liquidity, Different Rules
Under the PISCES sandbox rules, platforms like the LSE’s PSM will run periodic trading events, not continuous trading, allowing private firms to set windows for share transactions and to limit participants to qualified investors, employees and selected retail pools in some cases.
The framework reduces many continuous-market obligations while imposing tailored disclosure rules to suit private firms’ needs.
As Reuters reported, “The London Stock Exchange has become the first company to win regulatory approval to operate a new platform allowing investors to trade shares in private companies.” That regulatory green light is central: it legitimises intermittent private trading inside a recognised exchange structure, rather than leaving secondaries to opaque bilateral transactions. The model is designed to provide orderly price discovery in a controlled environment while preserving some privacy and flexibility for founders and early backers.
Will Private Trading Drain Public Markets of Listings?
One of the core debates is whether easier private liquidity will encourage companies to stay private longer, reducing IPO pipelines.
Proponents argue PSM can be a stepping-stone, helping firms mature governance and investor relations before a full public listing.
Critics counter that firms may instead treat PSM as an alternative to listing, enjoying the benefits of external capital without the scrutiny and costs of public markets.
The Financial Times observed that the PISCES initiative “the FCA has approved the launch of the Private Intermittent Securities and Capital Exchange System (Pisces),” highlighting concerns that reduced disclosure requirements could weaken the public-market function of robust price discovery and accountability.
If larger numbers of late-stage firms opt for long-term private existence, public markets could shrink in both depth and breadth, affecting retail access to high-growth companies and altering long-run liquidity dynamics.
Market Participants’ Reactions — Investors, VCs and Exchanges Respond
Responses from venture capital firms, institutional investors and advisers have been mixed. Some VCs view regulated intermittent liquidity as a welcome exit channel for limited partners and employees; others worry it creates valuation ambiguity and insider advantage.
The PSM may attract specialized fund flows and trading desks that focus on unlisted securities, but it may also prompt tighter due diligence and bespoke liquidity risk premia.
Bloomberg noted a related development, reporting that “The London Stock Exchange has partnered with Crowdcube Ltd. to open up late-stage private companies to thousands of eligible retail investors on its PISCES exchange,” a move that broadens the audience but raises debate about investor protection and suitability.
Market intermediaries will need to adapt: brokers, custodians and data providers must develop new workflows and pricing models for intermittent private-share auctions, and regulators will monitor whether PSM amplifies or dampens systemic risks.
Broader Implications — Regulation, Transparency and the Future of Listings
The launch of PSM platforms through the PISCES sandbox raises larger policy questions. Will regulators revert to stricter disclosure or permit a long-term dual-market equilibrium where many successful growth firms remain private?
The trade-off is clear: lower compliance costs can spur growth and entrepreneurship, but they can also reduce transparency and available information for wider investor bases.
For public markets, the risk is structural shrinkage, fewer IPOs, thinner secondary markets, and more concentrated ownership. Conversely, if PSM proves to be a funnel into public listings (by professionalising private liquidity), it could revitalise the IPO pipeline.
Policymakers and market participants must monitor outcomes: liquidity metrics, the number of firms opting out of IPOs, valuation dispersion between private auctions and later public listings, and investor protection incidents.
The next 3–5 years will determine whether PSM restores London’s capital-raising appeal or quietly reroutes substantial capital away from public markets.